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Stock-based Payments and Director Fees - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Aug. 01, 2019
Apr. 01, 2019
Jul. 31, 2018
Jul. 24, 2017
Aug. 17, 2016
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Management fees           $ 2,100,000     $ 3,900,000        
Annual retainer amount               $ 75,000          
Related party expense – management fee           2,143,000 $ 1,652,000   3,942,000 $ 3,340,000      
Thetis                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Related party expense – management fee             1,600,000     3,200,000      
Thetis | Management fees                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Related party expense – management fee           2,143,000 1,652,000   $ 3,942,000 3,340,000      
Restricted stock | Employees                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of restricted stock awards issued to independent directors (in shares) 79,000   36,500 39,000                  
Vesting period                 3 years        
2014 Director Equity Plan                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Annual Retainer Received In Shares   40.00%           50.00%          
Annual Retainer Received In Cash   60.00%           50.00%          
Vesting period                 1 year        
2014 Director Equity Plan | Restricted stock                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Annual Retainer Received In Shares And Cash Amount   $ 100,000           $ 75,000          
Long term incentive plan | Restricted stock | Employees                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares forfeited (in shares)                     333    
Long term incentive plan | Initial public offering | Restricted stock                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of restricted stock awards issued to independent directors (in shares)                 2,000        
Vesting period                 1 year        
Management fees                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Amount of expense recognized           $ 0 $ 800,000     $ 1,600,000      
Employee And Service Provider Grants | Restricted stock | Employees                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of restricted stock awards issued to independent directors (in shares)         153,000                
Employee And Service Provider Grants | Long term incentive plan | Restricted stock                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares forfeited (in shares)                   1,667   2,666 4,000
Employee And Service Provider Grants Third Option | Long term incentive plan | Restricted stock                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares forfeited (in shares)                     2,500